Drill guide



March 25, 1941. J. G. Elem-:OFF

DRILL GUIDE Filed Aug. 1s, 1939 2 Sheets-Sheet l s ,//ZF

MMM/Y March 25, 1941. J. G. ElcKHoFF D RILL GUIDE Filed Aug.' 16, 1939 2 sheets-sheet 2 Patented Mar. 255 1941 PATENT OFFICE DRILL GUIDE Jenn c. Eieknnfi, cola spring, Minn., assigner in Cold Spring Granite Company, Cold Spring, Minn., a corporation of Minnesota Application August 16, 1939, serial No. 290,390 s clninis. (cl. zas-s1) My invention relates to rock drills and particularly to guides therefor to be used in interlappingor broaoh drilling. In quarrying operations it is common practice to cut blocks of rock from the main body thereof by drilling series of spaced parallel bores in the rock and then drilling additional @bores between the interlapping into the bores of said series. In drilling the above mentioned additional bores, limoni-ty is frequently encountered due to the drill working toward and into a bore -of the original series instead of following a line parallel to and midway between Itwo bores of r the origin-al series. Also, accumulation of dust 1J Iand granular product-s of a drilling operationin a bore being drilled .tends to interfere with the drilling operation.

An object of my invention is to provide a device capable of use to eiectively and relatively accurately guide a drill in drilling of parallel linterlaplpilfig bores. i

Another object is to provide such a. device constructed to enable a drill to be quickly and easily placed in or removed from operative relation therewith.

Still another object is to provide such a device having incorporated therein means flor conveying and directing uid under pressure in'such a manner as to effect removal of d ust and partioles of material from a bore .which is being dllllled;

A iurtherobject is to provide such a device of simple, light, compact, rugged and inexpensive construction.

These and other objects and advantages of my invention will more fully appear from the following description made in connection with the accompanying drawings, wherein .like reference characters refer to the same pants throughout the views, and in which:

Fig. 1 is a. partially broken away, partially sectional side view of an embodiment of my invention shown in association witlla drill and a body of material on which dri-lling operations are' being A15-periormed;

Fig. 2 is a. Itop view of the mass of material of lFlig. 3 is a sectional view taken on the line 3-3 of Fig. 1 as indicated by the arrows and drawn to enlarged scale;

Fig.A 4 is a view partly in si-de elevation and partly in ventical section of another embodiment oi my invention; y Fig. 5 is la section taken approximately on the line 5-*5 o1 Fig. 4; and

neck lo.

Fig. 6 is a. section .taken approximately on the line 6--46 of Fig. 4.

Refer-lling to the drawings an embodiment of' my invention is shown associated with a drill of conventional form having a shank 4 on which an enlarged cutting head 4a-is removably mounted as, for example, by means of screw threads. The combination of my devi-ce Iand the drill are` shown in operative relation with la. mass 5 of material such as rock. '10

In quarrying operations it is customary in mak- `ing a cult in` a body of rock to first drill a series of holes ou' bores 6 which are disposed parallel toY each other and are spaced apallt by a s'uiteble distance. AAfter .this original senese: holes 15 has been drilled, other holes 1 are drilled between the holes of the original series in interlapping relation therew'th so that the holes liA and 1 aire al1 in communication with each other and constitute a. cut in the mass 5 of material. 20 In driling the holes 1 of the second series thereof the drill 4 is operated 'to re ove a body of material such as that indicated by dotted lines at 1a. In' drilling out the body of materiau 1a the drillV has a 'tendency to be displaced side-i25 wardly into one or the, other immediately adjacent holes or bores 6 of the original series. It is this displacement of the drill which my device is designed to prevent.

My device includes an elongatedy body 8 pref- 30 enably of generally cylindrical shape adapted to slide longitudinally in one of the bores 6 of the original series thereof. The member 8 is provided with an interior space or passage 9 adapted for a fluid such as air or water. 35 Aft its upper end the member 8 is provided witl an upwardly extending neck l0 which is vertically alpenturedto form an inlet point I0'a for uid under pressure. A flexible conduit .Il may be .telescoped on to the inletneck i0 and may 40 be secured .thereon by suitable means such as wire bands I=2 tighltly encircling the exterior of l .l the portion of .the conduit il located on the Means for guiding a drill is carried 'by the 45 memberf. This means-may and preferably does consist of a U-shaped guide I3 disposed parallel to the upper end of the member and extending upwardly above the upper end of the member 8. The U-shalped guide I3 is so posi- 50 tioned .that the open side thereof faces in a. 'direction normal to a verticalplane containing the lon tudinal axes oi the member 8 and the guide I3. The guide i3 has internal dimensions such that the shank 4 'of a. dr-ili tobe usedwith the 55 8 and .the guideA I3 is such that .the axis of a drill shank 4 will be equi-distant 4between' the axes of the two adjacent bores 6 of the previously described original series of bores whenl the member 8 is disposed in one bore of said pair.

The lower portion of the member 8 is cut away 'or flattened at the side thereof nearest the guide,

I8 at 8a to provide clearance between the member 8 and .the enlarged`head 4a of adr-ill. This cutting away or attening of the member 8 also provides a fluid passage between the lower por'- tion of the member 8 and the body 1a' of material to be removed.

The lower end of the member 8 includes 'a bottom wall 8b .which preferably slopes upwardly toward the right as viewed in the drawings. A fluid outlet port I5 is formed in the leftvhand portion of the bottom Wall or closure 8b of the member 8. Another fluid outlet poi-rt I8 is formed in theperipheral wall of the member 8 inthe flattened portion 8a thereof and immediately above. the bottom wall or closure 8b.

.The fluid outlet ports I5 and I6. the passage' 8, andthe fluid inlet port Ilia constitute means for handling a fluid infsuch a manner as to blow or ilushaway particles and chips of material removed from the body of-material 1c by the enlarged cutting'head 4av of a drill.

In operation of the device, the device and a drill 4 are associated with amass of material 5 as shown in Fig. 1, the mass of material 5 previously having had the original series of spaced bores 6 drilled therein. Obviously the drill shank 4 is free to move vertically in the guide I3 but cannot move relative thereto' in a direction either toward -or away from the bores 6 disposed at respective sides of the body of material 1a on which the drill is working. ,As the drill progresses downwardly the member 8 may also be shifted downwardly. It also should be apparent that the drill shank 4 may be readily placed-in or removed from the guide I3 bysideward movement relative thereto when the drill 4 and my device are not in association with a mass of vmaterial such as the mass 5.

A source of fluid under pressure is connected by means of the conduit II to the fluid inlet port Ia of the member 8. This fluid will nil the interior of the member 8 and will be expelled out of the member 8 through the fluid outlet ports I5 Vand I6. Fluid coming out of the lower fluid outlet port will ll the interior' of the bore 5 below the member `Il and being under pressure will flow upwardly through the passage between the 'flattened portion 8a ofthe member. 8 and the Ibody of material 1a on which the drill is workalong with fluid which has issued from the port.'

ing. Fluid issuing Afrom the right-hand uidoutlet port I 6 is deflected and carried upwardly I5 as previously described. 'I'his fluid from port I6 is directed against the rock immediately below the cutting head vto keep it cool. The'iluid will rise and will pass to the right past the enlarged cutting head `4a of the drill to cool the same and to carry the dislodged grains and chips of material into the bores 6 and 1 to, the right of the drill. Thus the drill will be kept clear of cuttings which would interfere with the operating .efficiency of the drill, and the maintenance of lower temperatures will greatly lengthen the effective life of the cutting head. If the4 fluid used is air, th dislodged material will be .blown away and if the fluid used is water, the material will' be flushed away from the cutting head.4a. From thestandpoint of eliminating dust at the scene of thedrilling' operation use -of water is preferable to use of air, but it is sometimes necessary to use air under pressure where the atmospheric temperature goes considerably below freezing. In extremely cold weather, water would freeze in .the bores and'completely halt the drillingoperation.

Figs. 4, 5 'and dillustrate another embodiment of my invention which is greatly preferred in some respects to that structure shown in' Figs. 1 through 3. A cylindrical drill body I1 is provided.

` It is generally similar to the cylindrical body 8 in the other form of the in'ventin. Itis hollow, and has suitably secured to its upper inlet a rubber hose I8 for conducting fluid to the interior of said body. The lower end of thebody I1 is provided with a downwardly opening port I8 and. as shownin Fig. 4, the right-hand lower portion of the body I1 is slanted to provide clearance between'said body and the wall of a bore in which it is inserted. The body I1 is also flattened, as clearly shown in'Fig. 4, similarly to the flattened portion 8a'of the body 8 in the other embodiment.

' Extending laterally from the body I1 is an upper U-shaped element 20 and a lower U-shaped between theU-shaped elements 20 and 2| is preferably somewhat greater than the diameter of the shank of any type of drilling tool, and as shown. the upper U'shaped element 20 is open at .one side while the lower element 2| is open at the opposite side.

The drill tool shank 22 is adapted to lie in the U-shaped elements 20 and 2I, as, shown, and it.

is inserted by tiltin'g it to an angle vapproximating the horizontal, placing it in the space 'between the two U-shaped elements. and then tilting it to a vertical position so that the bottom of the shank A -portion 24 of a drilling head or bit 25.` Thelwer end of shank 22 is enlarged as at 26 and the lower Ushaped shank-engaging element'2l is adapted to rest upon said enlargement 28. In the foregoing embodiment of the invention the U-' p shaped element I3 rests upon the upper shoulder of the drilling head or bit 4a. This causes frictional wear on the drilling head which'is eliminated by the enlarged lower end 26 of 22, shown in Fig. 4.

A .fluid outlet opening 21 is provided adjacent the lower end ofthe cylindrical guide .body I1,

the shank element 2|. These two elements are inspaced relation to each other and are formed on arcs of 'circles on a common vertical axis. The spacing The shank 22 is said opening being positioned in the side wall of the body immediately adjacent the teeth on the drilling head 25. AThus water or air is 'directed through. the opening 21 directly to the teeth so thatthe teeth themselves are cooled, Whereas in the preceding embodiment of the inventionfluid was directed from the opening I6 against rock or stoneaboutto be cut by the drilling head 4a.'

This embodiment of the invention it will be seen provides a drill guide for cutting rock and against movement into an adjacent previously cut bore, and the opposed arrangement of the U-shaped elements 20 and 2|, while permitting quick and simple application of a drill shank thereto, securely positions the shank against radial or lateral movement in any direction, making it impossible for the drill to creep away from its proposed line of cut. The outlet opening 21 is advantageously placed to direct liquid for cooling and for washing away stone dust immediately adjacent the cutterand the guide structure under no circumstances can come into frictional or other contact with the drilling It is apparent that I have invented a novel, compact, simple and inexpensive devicefor guiding a drill in drilling parallel interlapping bores and also clearing away material dislodged by i the drill.

It'will, of course, |be understood that various changes may be made in the form, proportions and arrangements of the various parts lwithout departing from the scope of my invention.

What is claimed is:

1. A device for guidinga drill having a shankequipped enlarged cutting head in drilling/para alle] interlapping bores comprising, a cylindrical member adapted to slide longitudinally in a completed bore, a drill shank guide disposed parallel to the upper portion of said member, and means rigidly interconnecting said ,member and said guide,.the respective axes of said member being so spaced that a bore drilled by a drill guided by said guide will interlap a bore containing said member, said member being cut away in portions for clearance from said cutter head, said member being hollow and having a closure and an inlet for fluid under pressure at its respective lower and upper ends. the peripheral wall of said member having a uid outlet port therethrough adjacent the lower end thereof at the side thereof nearest said guide and vsaid closure having a fluid outlet port therethrough diametrically opposite said first mentioned port.

2. A device for guiding a drill having a shankequipped enlarged cutting head in drilling parallel interlapping bores comprising, a cylindrical member adapted to slide longitudinally in a completed bore, an elongated drill shank guide of U-shaped cross section disposed parallel to the upper portion of said member with the open side of said guide taining the respective longitudinal axes of said member and said guide, and means rigidly inter' connecting said member and said guide, said axes being so spaced that a bore drilled by a drill guided. by said guide will interlap a bore -cqntaining said member, the side of the lower end of said member nearest said guide being suitably cut away to provide clearance between said member and said cutter head, said member being hollow and having a-closure and an inlet for fluid facing normal to a plane conunder pressure at its respective lower and upper ends, the peripheral a fluid outlet port `.therethrough adjacent the lower en d thereof at the side thereof nearest said guide and said closure having a iluid outlet port therethrough diametrically opposite said first mentioned port.

wall of said member having 3. A device for guiding a drill having a shankdrilling parallel bores equipped cutting head in comprising, a generally cylindrical member adapted to slide longitudinally in a completed of said member guide of substantially U-shape in cross section also supported by said cylindrical member, said second guide facing in a opposite to the `facing of said rst mentioned guide. A

4. The combination with a drill having an elongated shank and a cutting head carried at its lower end, of a member adaptedto slide longitudinally in a completed bore, means for supplying fluid to said member, the lower end having a downwardly opening uid outlet, and the side wall ,portion of said member having a second fluid outlet, a drill direction substantially shank guide engageable with said shankand lying substantially parallel to said longitudinally slidable member, the opening in the side wall of said latter member being positioned closely adjacent said cutting head and approximately at the v same level therewith.

with a source of fluid under having a shank and an ena broach drilling attachment 5. In combination pressure and a' drill larged cutting head,

comprising, a generally cylindrical member adapted to slide longitudinally in a completed bore, a drill shank guide disposed parallel to saidl member and connected therewith, said guide and member being supported from an enlargement adjacent the lower end of said drill, said member having a fluid passage therethrough, means for connecting the upper end of said passage with said source of fluid under pressure, and said member having a iiuid discharge in the lower portion thereof. y

6. In combination with a source of i'luidunder pressure and a drill having a shank and a cutting head a broach drilling attachment comprising, a generally cylindrical member adapted to slide longitudinally in a completed bore, a drill shank guide disposed parallel to said member and rigidadapted to slide longitudinally in a completedv bore, a drill shank guide disposed parallel to said member and rigidly connected theretmsaid mem.' ber extending some distance below the lower edge of said guide and, below the cutting head of a,

drill embraced by said guide, said member having a uid passage therein,.means for connecting the upper e'nd of said passage with said source o! iiuid under pressure`,vsaid member having a fluid discharge in the lower portion thereof, and said.

member having an external 'and longitudinally' extending recessbelow said shank guide, saidl recessed portion cooperating with a completed bore to dene a passage material.

8'. In combination with a sourceof duid under pressure and a drill having a shank and a. cutting for fluid andv groundl head, a broach drilling attachment comprising, a generally cylindrical member adapted to slide longitudinally in a completed bore, a drill shank guide disposed parallelto said member and rigidly connected thereto, said member dening a iluid passage extending from the upper portion thereof to the lower portion thereof, means for connecting the upper end of said passage with a source of fluid under pressure. and said member having a downwardly directed fluid discharge communicatingwith said passage in the lower portion thereof and also having a laterally extending uid discharge communicating with said passageand disposed adjacent the lower end of said passage and at the side of said member nearest said drill shank guide.

J OHN G. EICKHOFF. 

